Malicious PDF — malware analysis report

Static analysis result for SHA-256 c081018f76a99f5b…

MALICIOUS

PDF

74.8 KB Created: 2021-04-01 22:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf2cf9929f1d724eb4b1c1363f014a6 SHA-1: de76225cb18a9be0e589ce72b71c4dce45d33cae SHA-256: c081018f76a99f5bf04cd456d04f6e17ca8028bcbb412ba753be7c96c841ecaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a quiz. ClamAV and ML classifiers detected this file as a phishing or malicious PDF. The presence of numerous external links suggests an attempt to redirect the user to potentially malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/aws?utm_term=what+disney+character+do+i+look+like+filter
    • https://cdn.sqhk.co/jonimaze/bjb0Kgl/lep_s_world_2_gameplay.pdf
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fd07924be71c.pdf
    • https://cdn-cms.f-static.net/uploads/4423133/normal_6017b43c252de.pdf
    • https://cdn-cms.f-static.net/uploads/4383917/normal_601876c4d7eba.pdf
    • https://cdn-cms.f-static.net/uploads/4412415/normal_6029634c6b065.pdf
    • https://static.s123-cdn-static.com/uploads/4483855/normal_6005b0d0144b7.pdf
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fed8e7e2ba97.pdf
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdf
    • http://nigavereke.mygamesonline.org/95620842652.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tososite.onlinewebshop.net/rugul.pdf
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_67e8b4164d9b4e3eb8952fdfec27e23b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3502401-74fa-42ec-8136-88bcec5d459a/how_to_turn_chimes_on_grandfather_clock.pdf
    • https://uploads.strikinglycdn.com/files/3d598500-f5a9-417c-9914-4e65946c3de4/kekogawiviz.pdf
    • https://uploads.strikinglycdn.com/files/5c14785d-6bde-4266-9616-b2f2a0fac8be/what_are_the_holy_books_of_judaism_christianity_and_islam.pdf
    • https://uploads.strikinglycdn.com/files/f610ea91-2118-43d2-a5dc-524c2291db8c/reset_network_security_key_wireless_router.pdf
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_63838fa880004dd9987dffa1383b3d74.pdf?index=true
    • http://genolewedusu.myartsonline.com/55496184807.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41f.bin
90d8c162bbcae7e5c7dc260eed951a93dc8f38ab69eaba030e666544e1fb969b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 5288 bytes
font_01_sfnt_off0000f62b.bin
ed66979a764b910b08832daeee5f39f0b2b2584482812fda105b67158d6b7965		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 11304 bytes

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